Door-check.



lPatented Oct. 2l, |902.'

(No Model.)

vf. NITED STATES PATENT OFFICE.

SERN P. WATT, OF MORGAN PARK, ILLINOIS, ASSIGNOR TO HINE-W ATT MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No. 711,686, dated October 21, 1902.

Application led JanuaryZ, 1902. vSerial No. 88,103. (No model.)

To all whom it may concern:

Beit known that I, SERN P. WATT, residing at Morgan Park, Cook county, Illinois, have invented certain new and useful Improvements in Door-Checks, of which the following is a speciiication.

My invention relates to a door-check of the' same general construction and operation as that described and claimed in my prior application, filed August 27, 1901, Serial No.l

73,475, and is intended @as an improvement upon the door-check devicevshown in said application'.

The object of the present invention is to simplify the construction and increase the efficiency of my door-check, making the same in every way most reliable, easy of repair and assembling, and already having-the proper` dimensions, has a chamber in which the working parts of the door-checkv proper operate. The actuating shaft or spindle comprises a stem 2 of two parallel disks 3 and 4, which are almost of the same cross-sectional area as said chamber, so that there is no frictional engagement metal to metal at the sides, the lower disk 4 resting upon the substantially at bottom or floor of the chamber. are thus formed two chambers 5 and 6, the upper chamber being adapted to hold oil, grease, or other suitable lubricant, and hence here called the oil-chamber, and the lower chamber being adapted to hold the checking fluid, preferably a Vmixture of alcohol and glycerimand hence here called the checkchamber. The upper disk 3 is provided with a vertical marginalvange 7, forming a cylinder tting closely but operatively in the upper portion of the casing and constituting the There.

walls'of the oil-chamber, such cylinder in the present instance extending substantially to the top of the casing. As shown, the disks and flange 7 Vare provided with suitable packing 8 to prevent the possibility of the liquid used in the check-chamber from being forced up from the pressure thereof and between the inner wall of the casing-chamber and the outer surface of the cylinder. The casing ishere shown closedat its top and adapted to be closed atthe bottom by a screw-cap 9. tubular extension'or sleeve 10 depends centrally from the top of -such casing down as `far as the disk 3, thereby providing an accurate and long bearing for the operating shaft -or` spindle 2. `ing-nut 12 may be employed. The shaft 2 has a central bore in which extends and screws Suitable packing l1 and packthe regulating-valve 13, whose lower end 14` is preferably made conical and constitutes the valve proper. This valve is adapted to control or restrict communication between the two radial passages 15 and 16 in the said spindle, which passages correspond to the similar passages in thedevice described in my said former application and which .com-

municate between the high and low pressure v chambers on the opposite sides of the movable abutment. The movable abutment 17, itsfastening-pin` 18, and its check-valved passage 19 beingsimilar to the corresponding i parts in my said former application will re- .quire no detailed explanation or illustration.

The inner wall of the cylinder or shell 7 is provided with vertical opposite recesses 20 and 21, (moreclearly shown in Fig. 3,) which are adapted to receive and hold or anchor the outer end of 'the coiled spring 22. recesses are provided so that the spring may be reversed. The tubular extension 10 is pro- The two vided with the longitudinal grooves 23 to receive and hold the'inner end of such spring.` By preference the valve-stem 13 does not extend to the top/of theshaft 2 but has a screwdriver slot at its end, so that it may be adjusted up or down, a cap-screw 24. normally closing the end of the shaft. The object of this arrangement is to prevent or hinder change of adjustment by ignorant or ineXperienced users, my door-check being adapted to be properly adjusted at the shop for the work to be done. Furthermore, the amount of spring tension is determined at the shop, the adjustment being obtained by giving the shaft 2 a quarter-turn when the parts are being assembled.

The lower end of the operating-cylinder is bored to form a cylinder or chamber 25, which is closed at its lower end by a screw-plug 26. A piston 27, having a hollow stem 28, operates in said cylinder and is normally downwardly pressed by a spring 29. The upper end of the piston-stem is formed as a valveseat adapted to fit the valve 14 when such stem 28 is upwardly moved, as-hereinafter described. In the event of any too-violent starting orclosing of the door from any cause whatsoever the great pressure suddenly created in passages l5 and 16 is communicated downwardly through the hollow stem 2S and below the piston, which is thereupon forced upwardly and its valve-seat brought into contact with the valve, whereby communication between passages l5 and 16 is closed and free movement of the door provided until the great pressure ceases, whereupon the spring 29 will restore the parts to normal position. The object of the plug 26 is to separate the chamber 25 from the check-chamber, so that the pressure above described in passing through the piston-stein cannot get below the lower disk 4E and tend to raise it and bind the working parts.

The door-check above described is not only silnple in construction and operation, but it is so made as to avoid or overcome many of the objectionable features to which devices of this character have been found subject in practical use. My device is therefore not only simple and inexpensive in construction and operation, .as-just stated, but is reliable and eilcient in operation.

The two chambers 5 and 6 are sealed against each other, and the lower chamber 6 is especially sealed in such manner that the alcohol cannot escape or evaporate. Furthermore, the oil or grease in the upper chamber thoroughly lubricates the shaft 2 along its tubular bearing-sleeve 10. All frictional contact between the disks and iiange and the sides of the casing is avoided, and consequently there is no binding of such parts. The packing on the disks and iiange prevents intercommunication between chambers 5 and 6, and if any greater pressure in the lower chamber should by chance force any of the checking iiuid upwardly past the first packing further passage of such fiuid would be prevented by the other packings above, so that the two chambers are eiectually sealed one from the other. In like manner the movable abutment may have a packing-strip 30 and the stationary abutment 3l one or more strips 32 on its top and bottom.

As is well known, suitable checking fluid is highly evaporative, requiring packing and packing-boxes, which do not satisfactorily prevent evaporation. In my check device, however, the oil or grease in the upper chainber serves the purpose of sealing the checking-chamber below, and thereby prevents evaporation of its fluid, as well as the purpose of lubricating the operating-shaft or trunnion.

l. A door-check comprising a casing having a chamber, an operating shaft or spindle therein provided with two parallel disks bearing in such chamber, one of said disks having an upwardly-extending marginal fiange and a fixed and a movable abutment arranged between said disks and a regulated by-pass between opposite sides of the movable abutment.

2. Adoor-check comprisinga casing, an operating shaft or spindle therein provided with two parallel disks, one of said disks having a marginal ange, a fixed and a movable abut- ;ment arranged between said disks, a regua chamber, an operating shaft or spindle therein provided with two parallel disks bearing in such chamber, one of said disks having a marginal flange, a fixed and a `movable abutment arranged between said disks, a regulated by-pass between opposite sides of the movable abutment, such casing havinga tubular extension receiving said spindle, a spring in said chamber and means on both the` flange and tubular extension to hold the two ends of the spring.

4. A door-check comprising a casinghaving an integral top portion and open at its lower end, a removable closure for closing such open end of the casing, a central bearing-sleeve forming a part of said top of the casing and depending therefrom, an operatingv shaft or spindle bearing in said sleeve and door-check mechanism operated by such shaft or spindle.

5. Adoor-checkcomprisingacasinghaving a chamber into which depends a central tubular extension or bearing-sleeve integral with said casing, an operating shaft or spindle bearing in said sleeve and door-check mechanism operated by such shaft or spindle.

6. A door-check comprisinga casing having a fluid-chamber provided with a fixed and a movable abutment, an operating shaft' or spindle arranged therein, and connected to the movable abutment said shaft having a longitudinal bore connecting with a `transverse passage communicating on either side of the movableabutment, a valve in said bore for regulating said passage, and a piston adapted to be moved by extraordinary pressure exerted in said chamber and having a stem movable in the bore and adapted to seat upon the end of said valve to close such passage.

7. Adoor-checkcomprisingacasinghaving a Huid-chamber provided with a fixed and a IIO IZO

NAA-4 movable abutment, an operating shaft or spindle arranged therein, and connected to the movable abutment, said shaft having a longitudinal bore connecting with a transverse passage communicating on either side of the movable abutment, a valve in said bore for regulating said passage, a stem movable in the bore and adapted to seat upon the end of said valve, and means for automatically actuating said stem under extraordinary conditions and thereby causing restriction of said passage independently of the Valve as to its normal function.

8. Adour-checkcomprisingacasinghaving a Huid-chamber provided with a fixed and a movable abutment, an operating shaft or spindle arranged therein, and connected to the movable abutment said shaft havinga longitudinal bore connecting with a transverse passage communicating on either side of the movable abutment, a valve in said bore for regulating said passage, said valve having a substantially conical-shaped end to form the valve proper, a stem having a conical-shaped socket forming a valve-seat for said valve, and means for actuating said stem under eX- traordinary conditions.

9. Adoor-checkcomprisingacasinghaving a Huid-chamber provided with a fixed and movable abutment, an operating shaft .or spindle arranged therein, and connected to the movable abutment, said shaft having a longitudinal bore connecting with a transverse passage communicating on either side of the movable abutment, a valvel in said bore for regulating said passage, said valve having a substantially conical-shaped end to form the valve proper, a stem having a conical-shaped socket forming a valve-seat for said valve, and having a central bore and a piston connected to said stem.

10. A door-check comprising a casing having a fluid-chamber provided with a xed and movable abutment, an operating shaft or spindle arranged therein and connected to the movable abutment, said shaft having a longitudinal bore connecting with a transverse passage communicating on either sideof the movable abutment, a valve in said bore for regulating said passage, the lower end of said spindle being counterbored to form a cylinder, means for closing the lower end of such cylinder, a piston having a hollow stem whichis movable in said bore of the spindle and is adapted to seat against said valve.

11. A door-check comprising a casing having a Huid-chamber provided with a fixed and movable abutment, an operating shaft or spindle arranged therein, and connected to the movable abutment, said shaft having a longitudinal bore connecting with a transverse passage communicating on either side of the movable abutment, a valve in said bore for regulating the passage said spindle having a piston-chamber 25, closed bya plug 26, a piston 27 adapted to operate in said chamber and having a hollow stem 2S whose free end is formed as a valve-seat.

12. A door-check comprising a casing 1, having a chamber, an operating shaft or spindle 2 having the two disks 3 and 4, the latter thereof bearing upon the bottom of said chamber andthe former thereof having an eX- tended marginal flange 7, said casing having a tubular extension or sleeve l0 receiving the spindle, a spring 22 secured respectively to the flange 7 and extension 10, fixed and movable abu tments between the disks and means for regulating the 'equalization of pressure on opposite sides of the movable abutment.l

13. A door-check comprising a casing 1, having a chamber, an operating shaft or spindle 2 having the two disks 3 and 4, the latter thereof bearing upon the bottom of said chamber and the former thereof having an eX- tended marginal ange 7, the disks being provided with packing, said spindle having passages 15 and 16 communicating with the space below said disk 3, a valve 14 in saidfbore for controlling fluid through passages 15 and 16, fixed and movable abutments between said disks, and a spring 22 operatively connected to the casing and to the iiange 7. y

14. A door-check comprising a casing 1, having a chamber, an operating shaft or spindle 2 having the two disks 3 and 4, the latter thereof bearing upon the bottom of said chamber and the former thereof having an extended marginal fiange 7, said liange and said disks being free of frictional contact with the sides of the chamber and having packing.

15. A door-check comprising a`casing 1, a shaft or spindle working therein and having two disks whereby there are formedv an oilchamber 5 and check-duid chamber 6,.a movable abutment connected to the disks and a stationary abutment to the casing, and packing arranged on both abutments and on the edges of said disks.

16. In a door-check, the combination of a casing having a checking-Huid chamber and a sealing-fluid chamber, the fluid in the latter chamber serving to seal the first-named chamber and thereby prevent evaporation of its Huid.

17. In -a door-check, the combination of a casing provided with door-check mechanism and having a checking-fluid chamber and a second chamber adapted to contain oil which serves to seal the checking-duid chamber and also to lubricate the door-check mechanism.

SERN P. WATT.

Witnesses:

SAMUEL E. HIABBEN, Louis B. ERWIN.

ICO 

